package net.minecraft.world.level.levelgen;

import net.minecraft.core.BlockPos;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.stats.ServerStatsCounter;
import net.minecraft.stats.Stats;
import net.minecraft.util.Mth;
import net.minecraft.util.RandomSource;
import net.minecraft.world.DifficultyInstance;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityTypes;
import net.minecraft.world.entity.SpawnGroupData;
import net.minecraft.world.entity.monster.Phantom;
import net.minecraft.world.level.CustomSpawner;
import net.minecraft.world.level.NaturalSpawner;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.gamerules.GameRules;
import net.minecraft.world.level.material.FluidState;

public class PhantomSpawner implements CustomSpawner {
	private int nextTick;

	@Override
	public void tick(final ServerLevel level, final boolean spawnEnemies) {
		if (spawnEnemies) {
			if (level.getGameRules().get(GameRules.SPAWN_PHANTOMS)) {
				RandomSource random = level.getRandom();
				this.nextTick--;
				if (this.nextTick <= 0) {
					this.nextTick = this.nextTick + (60 + random.nextInt(60)) * 20;
					if (level.getSkyDarken() >= 5 || !level.dimensionType().hasSkyLight()) {
						for (ServerPlayer player : level.players()) {
							if (!player.isSpectator()) {
								BlockPos playerPos = player.blockPosition();
								if (!level.dimensionType().hasSkyLight() || playerPos.getY() >= level.getSeaLevel() && level.canSeeSky(playerPos)) {
									DifficultyInstance difficulty = level.getCurrentDifficultyAt(playerPos);
									if (difficulty.isHarderThan(random.nextFloat() * 3.0F)) {
										ServerStatsCounter stats = player.getStats();
										int value = Mth.clamp(stats.getValue(Stats.CUSTOM.get(Stats.TIME_SINCE_REST)), 1, Integer.MAX_VALUE);
										int dayLength = 24000;
										if (random.nextInt(value) >= 72000) {
											BlockPos spawnPos = playerPos.above(20 + random.nextInt(15)).east(-10 + random.nextInt(21)).south(-10 + random.nextInt(21));
											BlockState blockState = level.getBlockState(spawnPos);
											FluidState fluidState = level.getFluidState(spawnPos);
											if (NaturalSpawner.isValidEmptySpawnBlock(level, spawnPos, blockState, fluidState, EntityTypes.PHANTOM)) {
												SpawnGroupData groupData = null;
												int groupSize = 1 + random.nextInt(difficulty.getDifficulty().getId() + 1);

												for (int i = 0; i < groupSize; i++) {
													Phantom phantom = EntityTypes.PHANTOM.create(level, EntitySpawnReason.NATURAL);
													if (phantom != null) {
														phantom.snapTo(spawnPos, 0.0F, 0.0F);
														groupData = phantom.finalizeSpawn(level, difficulty, EntitySpawnReason.NATURAL, groupData);
														level.addFreshEntityWithPassengers(phantom);
													}
												}
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
	}
}